KATSCHER, 10 Pfg dark red-orange, 15 Pfg grey-violet, 20 Pfg blue, 30 Pfg orange, 40 Pfg green-olive Plebiscite of 20 March 1921 on propaganda postcard (onion dome of Groß-Katscher) with perfectly central rare single-circle KATSCHER 20 3 21 cancels (OS handbook No. 140.1), card folded horizontally and vertically